월간 인기 게시물

게시물 716건
   
openstack database nova nova_cell0 difference
글쓴이 : 최고관리자 날짜 : 2024-12-12 (목) 11:45 조회 : 266
                                
OpenStack database nova nova_cell0 difference

In OpenStack, nova and nova_cell0 are integral parts of the Nova service architecture, particularly in a deployment that uses cells. Here's a breakdown of their differences and purposes:

Nova Database

  • The Nova database is the primary database for the Nova service.
  • It stores global information related to instances, flavors, host aggregates, availability zones, and more.
  • Data in the Nova database is structured to manage and coordinate resources across all cells in a multi-cell setup.
  • It is essential for the overall orchestration and high-level state management of instances across the OpenStack cloud.

Nova Cell0 Database

  • The nova_cell0 database is specific to the cell0 construct introduced in Nova with the Cells v2 architecture.
  • It acts as a placeholder database for instances that fail scheduling (i.e., instances that cannot be mapped to any host or cell).
  • When an instance cannot be scheduled (for example, due to lack of resources), its metadata is recorded in nova_cell0. This helps to ensure consistent tracking of such instances, even if they are not successfully deployed.

Key Differences

FeatureNova DatabaseNova Cell0 Database
PurposeCentral database for global Nova service information.Placeholder for failed-to-schedule instances.
ScopeManages all cells and global state across OpenStack.Specific to tracking unscheduled instances.
UsageActive management of instances, resources, and services.Records metadata for failed instances.
Connection to CellsInteracts with all cells in a multi-cell setup.Does not interact with other cells.

Why is Nova Cell0 Important?

Before the introduction of nova_cell0, unscheduled instances could lead to inconsistencies or orphaned records in OpenStack environments. nova_cell0 ensures:

  • Consistency in the database structure.
  • A clear audit trail for instances that failed scheduling.
  • Improved debugging and troubleshooting for deployment issues.

This distinction is particularly important in large-scale OpenStack deployments that use Cells v2, where each cell typically has its own database and message queue, but nova_cell0 remains a global construct.


이름 패스워드
스타일
굴림
10pt
<html> <body>
 
 
 
 
비밀글 (체크하면 글쓴이만 내용을 확인할 수 있습니다.)
왼쪽의 글자를 입력하세요.
   

 



 
사이트명 : 모지리네 | 대표 : 이경현 | 개인커뮤니티 : 랭키닷컴 운영체제(OS) | 경기도 성남시 분당구 | 전자우편 : mojily골뱅이chonnom.com Copyright ⓒ www.chonnom.com www.kyunghyun.net www.mojily.net. All rights reserved.